| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47159: net: dsa: fix a crash if ->get_sset_count() fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: dsa: fix a crash if ->get_sset_count() fails |
| |
| If ds->ops->get_sset_count() fails then it "count" is a negative error |
| code such as -EOPNOTSUPP. Because "i" is an unsigned int, the negative |
| error code is type promoted to a very high value and the loop will |
| corrupt memory until the system crashes. |
| |
| Fix this by checking for error codes and changing the type of "i" to |
| just int. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47159 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.7 with commit badf3ada60ab8f76f9488dc8f5c0c57f70682f5a and fixed in 4.19.193 with commit 0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37 |
| Issue introduced in 4.7 with commit badf3ada60ab8f76f9488dc8f5c0c57f70682f5a and fixed in 5.4.124 with commit ce5355f140a7987011388c7e30c4f8fbe180d3e8 |
| Issue introduced in 4.7 with commit badf3ada60ab8f76f9488dc8f5c0c57f70682f5a and fixed in 5.10.42 with commit caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6 |
| Issue introduced in 4.7 with commit badf3ada60ab8f76f9488dc8f5c0c57f70682f5a and fixed in 5.12.9 with commit 7b22466648a4f8e3e94f57ca428d1531866d1373 |
| Issue introduced in 4.7 with commit badf3ada60ab8f76f9488dc8f5c0c57f70682f5a and fixed in 5.13 with commit a269333fa5c0c8e53c92b5a28a6076a28cde3e83 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47159 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/dsa/master.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37 |
| https://git.kernel.org/stable/c/ce5355f140a7987011388c7e30c4f8fbe180d3e8 |
| https://git.kernel.org/stable/c/caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6 |
| https://git.kernel.org/stable/c/7b22466648a4f8e3e94f57ca428d1531866d1373 |
| https://git.kernel.org/stable/c/a269333fa5c0c8e53c92b5a28a6076a28cde3e83 |
